What do Whitney and Rainsford do for careers?

In Richard Connell's short story entitled "The Most Dangerous Game," Sanger Rainsford and his friend Whitney are big-game hunters.
Rainsford plays a significant role in Connell's narrative about a strange island inhabited by a bizarre Cossack who hunts another type of game, while Whitney is only present in the exposition of the story. Nevertheless, he acts as a foil to Rainsford, illuminating Rainsford's perspective of the hunter and the hunted, a perspective that later figures into the developing plot.
As the narrative begins, Whitney and Rainsford are traveling on a steamer in South America to hunt jaguars. Whitney anticipates "good hunting up the Amazon." Then, he reflects upon the role of the animal to be hunted, and he clarifies his previous statement: "For the hunter . . . Not for the jaguar." Rainsford scoffs at his friend's clarification, telling him not to "talk rot" as he points out to Whitney, "You're a big-game hunter, not a philosopher . . . Who cares how a jaguar feels?" The irony of this remark of Rainsford's is that by a strange twist of fate, he has his role as a hunter surprisingly changed to that of the hunted. And, with his reversal of roles, Rainsford comes to empathize with the hunted animal, after all.